weather check for astrosib dome daemon

Daemons/deprecated/netdaemon/term.c

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+/*                                                                                                  geany_encoding=koi8-r
+ * client.c - terminal parser
+ *
+ * Copyright 2018 Edward V. Emelianoff <eddy@sao.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <strings.h> // strncasecmp
+#include <time.h>    // time(NULL)
+#include <limits.h>  // INT_MAX, INT_MIN
+#include "term.h"
+
+#define BUFLEN 1024
+
+sl_tty_t *ttydescr = NULL;
+
+static char buf[BUFLEN];
+
+/**
+ * read strings from terminal (ending with '\n') with timeout
+ * @return NULL if nothing was read or pointer to static buffer
+ */
+static char *read_string(){
+    if(!ttydescr) ERRX("Serial device not initialized");
+    size_t r = 0, l;
+    int LL = BUFLEN - 1;
+    char *ptr = NULL;
+    static char *optr = NULL;
+    if(optr && *optr){
+        ptr = optr;
+        optr = strchr(optr, '\n');
+        if(optr) ++optr;
+        //DBG("got data, roll to next; ptr=%s\noptr=%s",ptr,optr);
+        return ptr;
+    }
+    ptr = buf;
+    double d0 = sl_dtime();
+    do{
+        if((l = sl_tty_read(ttydescr))){
+            r += l; LL -= l; ptr += l;
+            if(ptr[-1] == '\n') break;
+            d0 = sl_dtime();
+        }
+    }while(sl_dtime() - d0 < WAIT_TMOUT && LL);
+    if(r){
+        buf[r] = 0;
+        //DBG("r=%zd, got string: %s", r, buf);
+        optr = strchr(buf, '\n');
+        if(optr) ++optr;
+        return buf;
+    }
+    return NULL;
+}
+
+/**
+ * Try to connect to `device` at baudrate speed
+ * @return 1 if OK
+ */
+int try_connect(char *device, int baudrate){
+    if(!device) return 0;
+    fflush(stdout);
+    ttydescr = sl_tty_new(device, baudrate, 1024);
+    if(ttydescr) ttydescr = sl_tty_open(ttydescr, 1); // exclusive open
+    if(!ttydescr) return 0;
+    while(sl_tty_read(ttydescr)); // clear rbuf
+    LOGMSG("Connected to %s", device);
+    return 1;
+}
+
+/**
+ * run terminal emulation: send user's commands and show answers
+ */
+void run_terminal(){
+    if(!ttydescr) ERRX("Terminal not connected");
+    green(_("Work in terminal mode without echo\n"));
+    int rb;
+    size_t l;
+    sl_setup_con();
+    while(1){
+        if((l = sl_tty_read(ttydescr))){
+            printf("%s", ttydescr->buf);
+        }
+        if((rb = sl_read_con())){
+            char c = (char) rb;
+            sl_tty_write(ttydescr->comfd, &c, 1);
+        }
+    }
+}
+
+/**
+ * Poll serial port for new dataportion
+ * @return: NULL if no data received, pointer to string if valid data received
+ */
+char *poll_device(){
+    char *ans;
+    double t0 = sl_dtime();
+    while(sl_dtime() - t0 < T_POLLING_TMOUT){
+        if((ans = read_string())){ // parse new data
+            DBG("got %s", ans);
+            /*
+             * INSERT CODE HERE
+             * (data validation)
+             */
+            return ans;
+        }
+    }
+    return NULL;
+}